2013-11-12 19:50:46 +01:00
|
|
|
<!DOCTYPE html>
|
|
|
|
|
<html>
|
|
|
|
|
<head>
|
|
|
|
|
<meta charset='utf-8'>
|
|
|
|
|
<title>RocksDB | A persistent key-value store for fast storage environments</title>
|
|
|
|
|
<link rel='stylesheet' href='static/rocksdb.css' type='text/css'/>
|
|
|
|
|
<link rel='shortcut icon' href='static/favicon.ico'>
|
|
|
|
|
<meta name='viewport' content='width=device-width'>
|
|
|
|
|
<meta property='og:type' content='website'>
|
|
|
|
|
<meta property='og:title' content='RocksDB | A persistent key-value store for fast storage environments'>
|
|
|
|
|
<meta property='og:description' content='A persistent key-value store for fast storage environments'>
|
2013-11-13 00:13:32 +01:00
|
|
|
<meta property='og:image' content='http://rocksdb.org/static/rocksdb.png'>
|
2013-11-12 19:50:46 +01:00
|
|
|
</head>
|
|
|
|
|
<body>
|
|
|
|
|
|
|
|
|
|
<header class='topbar'><nav class='width'>
|
|
|
|
|
<a href='index.html'><h1>RocksDB</h1></a>
|
|
|
|
|
<ul>
|
|
|
|
|
<li><a href='overview.html' class='active'>Overview</a></li>
|
|
|
|
|
<li><a href='https://github.com/facebook/rocksdb/wiki/_pages'>Wiki</a></li>
|
|
|
|
|
<li><a href='https://github.com/facebook/rocksdb'>GitHub</a>
|
|
|
|
|
</ul>
|
|
|
|
|
</nav></header>
|
|
|
|
|
|
|
|
|
|
<header class='hero'><div class='width'>
|
|
|
|
|
<hgroup>
|
|
|
|
|
<h1>
|
|
|
|
|
Overview
|
|
|
|
|
</h1>
|
|
|
|
|
</hgroup>
|
|
|
|
|
</div></header>
|
|
|
|
|
|
|
|
|
|
<section class='content'><div class='width'>
|
|
|
|
|
|
|
|
|
|
<article>
|
|
|
|
|
|
|
|
|
|
<h2>Opening A Database</h2>
|
|
|
|
|
<p>
|
|
|
|
|
A <code>rocksdb</code> database has a name which corresponds to a
|
|
|
|
|
file system directory. All of the contents of database are stored in
|
|
|
|
|
this directory. The following example shows how to open a database,
|
|
|
|
|
creating it if necessary:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<pre>#include <assert>
|
|
|
|
|
#include "rocksdb/db.h"
|
|
|
|
|
|
|
|
|
|
rocksdb::DB* db;
|
|
|
|
|
rocksdb::Options options;
|
|
|
|
|
options.create_if_missing = true;
|
|
|
|
|
rocksdb::Status status = rocksdb::DB::Open(options, "/tmp/testdb", &db);
|
|
|
|
|
assert(status.ok());
|
|
|
|
|
...</pre>
|
|
|
|
|
|
|
|
|
|
<p>
|
|
|
|
|
If you want to raise an error if the database already exists, add
|
|
|
|
|
the following line before the <code>rocksdb::DB::Open</code> call:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<pre>options.error_if_exists = true;</pre>
|
|
|
|
|
|
|
|
|
|
<h2>etc...</h2>
|
|
|
|
|
</article>
|
|
|
|
|
|
|
|
|
|
</div></section>
|
|
|
|
|
|
|
|
|
|
<footer><div class='width'>
|
|
|
|
|
© Copyright 2013, Facebook
|
|
|
|
|
</div></footer>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
